Note 1: Please see my RC-E Calculator which includes wing loading, flight time, prop thrust, energy density, current draw and many other calculators:Google Play Store Link ► RC E Calc ProNote 2: Please email if you have a problem or suggestionNote 3: This app was built with MIT App Inventor, the permissions* (see below) required are the defaults, I have no control over what permissions Google/MIT App Inventor requires an app to have. This app has been published on Google Play for 4 years since 2012 and since it is still here you can be assured that Google Play has no problems with it.

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This may prevent your plane from crashing!

"A nose-heavy airplane may not fly well, but a tail-heavy airplane may fly only once."

This app will calculate the POSITION of the Center of Gravity (CG or CoG or Balance Point) measured back from the leading edge at the wing root in the units of your choice.

This calculator uses the Neutral Point, the AIRCRAFT'S aerodynamic center (AC), as a reference point to calculate the CG range. It uses a well known, simple but fairly reliable method of determining the CG of a model aircraft.

Version 2.0+: implemented due to Google licensing changes.- No longer requires a button tap to calculate, calculates automatically after the all the fields are filled.- Added wing Area calculation- Changed layout for ease of use/visibility- Fixed small bugs

android.permission.INTERNET - to check for updates and so that the screen's background image property can be set to the URL of an image on the web if there is a background imageandroid.permission.WRITE_EXTERNAL_STORAGE - to move the app to EXT SD on your phone if necessary.android.permission.READ_PHONE_STATE - to check for incoming phone calls and then hide the app if necessary.android.permission.READ_EXTERNAL_STORAGE - access the app on EXT SD if necessary.)